The STIHL MS 400 Chainsaw is a high-performance tool designed for professional loggers and DIYs. Known for its robust construction, reliable cutting performance, and ergonomic design, the MS 400 is part of STIHL’s renowned line of chainsaws.
It is launched as an upgrade to the popular MS 391 model, and offers more power and efficiency, making it a popular choice for heavy-duty cutting tasks. However, like any machinery, the MS 400 is not without its share of problems. In this article, we’ll explore the key features of the STIHL MS 400 Chainsaw and highlight some potential issues users might encounter.
Key Features of the STIHL MS 400 Chainsaw
Engine Power and Performance
The MS 400 boasts a powerful two-stroke engine with STIHL’s innovative M-Tronic technology, which automatically adjusts the fuel mixture for optimal performance at all operating conditions. This results in consistent power delivery and improved fuel efficiency, enabling the chainsaw to handle demanding tasks with ease.
Durability and Build Quality
STIHL is renowned for manufacturing durable and robust chainsaws, and the MS 400 is no exception. Its magnesium alloy crankcase and high-quality components contribute to its longevity, allowing it to withstand tough environments and prolonged use.
Ergonomic Design
The MS 400 is engineered with user comfort in mind. Its well-balanced design, anti-vibration system, and comfortable grip minimize operator fatigue during extended periods of operation.
Easy Maintenance
The MS 400 features easy-to-access maintenance points, such as tool-less air filter access and a side chain tensioner, simplifying routine tasks and reducing downtime.
Potential Problems with the STIHL MS 400 Chainsaw
While the STIHL MS 400 Chainsaw is designed for heavy-duty applications, like any piece of equipment, it may encounter some problems during its lifespan. It’s essential for users to be aware of these potential issues to ensure safe and efficient operation:
1. Starting Issues
Some users have reported difficulty starting the MS 400, particularly when the engine is cold. This could be due to various factors, such as a clogged air filter, old or contaminated fuel, or improper starting procedures. Regular maintenance and following the manufacturer’s starting guidelines can help mitigate this problem. For further details read our article on how to start a Stihl Chainsaw.
2. Overheating
Extended periods of heavy use may cause the MS 400’s engine to overheat, leading to performance issues and potential damage. Overheating can result from inadequate lubrication, operating the chainsaw at high RPM for prolonged periods, or a malfunctioning cooling system.
Users should ensure proper chain lubrication and avoid overloading the tool for extended durations.
3. Oil Leakage
Some users have reported oil leakage issues, wherein bar and chain oil may seep from the chainsaw during operation or storage. This problem could be caused by worn or damaged seals, improper assembly, or using low-quality oil. Regularly inspecting the chainsaw’s components and using recommended lubricants can help prevent oil leakage.
4. Chain Tensioning Problems
While the MS 400 features a side chain tensioner for convenient adjustment, some users have experienced difficulty in maintaining the proper chain tension. This issue may arise from a malfunctioning tensioner mechanism or insufficient lubrication on the chain. Regularly inspecting and cleaning the tensioner can help address this problem.
5. Broken Chain Brake
The chain brake is a critical safety feature that stops the chain from spinning when engaged. If the chain brake is broken or malfunctioning, it may fail to stop the chain’s movement even when activated.
If the chain brake is not functioning correctly, it’s essential to seek professional servicing or replacement. Attempting to repair the chain brake without proper knowledge and tools could lead to further safety hazards.
6. Stuck Throttle Trigger
One of the common reasons a chainsaw won’t stop spinning is a stuck or jammed throttle trigger. The throttle trigger controls the engine speed and chain movement. If it gets stuck due to debris, sawdust, or mechanical issues, the engine may remain engaged, causing the chain to spin continuously.
To address a stuck throttle trigger, follow these steps:
- First, engage the chain brake if possible. If the brake is not functioning correctly, proceed with caution.
- Disconnect the spark plug wire to prevent accidental starting.
- Check the throttle trigger for any visible debris or obstructions. Clean the trigger and surrounding area thoroughly.
- Lubricate the trigger mechanism with a suitable lubricant to ensure smooth movement.
- Try moving the throttle trigger gently to see if it releases. If not, the chainsaw may require professional inspection and repair.
7. Clutch or Clutch Drum Issues
The clutch assembly and clutch drum are essential components that engage and disengage the chain from the engine’s power. If the clutch drum is damaged, worn out, or improperly installed, it may not disengage the chain correctly, causing it to spin continuously.
Inspect the clutch drum for any signs of wear, damage, or misalignment. If any issues are identified, it’s best to take the chainsaw to an authorized STIHL service center for repair or replacement.
8. Engine Control Module (ECM) Malfunction
Some modern STIHL chainsaws have electronic engine control modules (ECMs) that regulate the engine’s RPM and performance. If the ECM malfunctions, it may not receive the signal to disengage the engine, causing the chain to keep spinning. This is something very technical that needs some expertise. Firstly, you must have first-hand knowledge of the parts of the chainsaw.
If you suspect an ECM issue, consult a certified STIHL technician who can diagnose and repair electronic components properly.
9. Worn or Damaged Clutch Springs
Clutch springs play a crucial role in engaging and disengaging the clutch assembly. If these springs are worn out, damaged, or improperly tensioned, they may fail to release the clutch properly.
Inspect the clutch springs for any signs of wear or damage. If necessary, replace them with genuine STIHL parts and ensure proper tensioning during assembly. Also, make sure that you properly and timely clean a chainsaw. If you are new and don’t know how to clean a chainsaw, give it a read!
My Stihl chainsaw won’t stop spinning
The STIHL MS 400 Chainsaw is a powerful and reliable tool, well-suited for professional cutting applications. Its robust construction, ergonomic design, and advanced features make it a popular choice in the chainsaw market.
However, users should be aware of potential problems such as starting issues, overheating, oil leakage, and chain tensioning problems. To ensure safe and efficient operation, regular maintenance, adherence to manufacturer guidelines, and proper use of recommended lubricants are essential. Overall, the STIHL MS 400 remains a top choice for professionals seeking a high-performance chainsaw, provided it is used and maintained correctly.
If a STIHL chainsaw won’t stop spinning, it indicates a serious and potentially hazardous issue that needs immediate attention. The spinning chain poses a significant safety risk to the operator and those nearby. It’s crucial to follow safety precautions, disconnect the spark plug wire, and seek professional assistance for inspection and repair. Attempting to fix the issue without adequate knowledge and experience may lead to further damage or injury. Remember that regular maintenance and timely servicing can prevent such problems and ensure safe and efficient chainsaw operation.
Why there is an Oil Leakage in my Chainsaw?
Chain oil leakage from a chainsaw is a common issue that can be caused by various factors. Chain oil is essential for lubricating the cutting chain and reducing friction, ensuring smooth operation, and prolonging the chain’s lifespan. When chain oil leaks excessively, it not only wastes oil but also poses a potential safety hazard and can lead to environmental concerns. In this section, we will discuss the possible causes of chain oil leakage and how to address the problem:
1. Overfilling the Oil Tank
One of the primary reasons for chain oil leakage is overfilling the oil tank. If the oil tank is filled beyond its recommended capacity, the excess oil can leak from various openings on the chainsaw.
To fix this issue, check the chainsaw’s user manual to determine the correct oil tank capacity. Drain any excess oil from the tank to the appropriate level.
2. Damaged or Worn Oil Tank Cap or Gasket
A damaged or worn oil tank cap or gasket can lead to oil leakage. If the cap does not seal the oil tank properly, the oil may escape from the tank during operation.
Inspect the oil tank cap and gasket for any signs of damage or wear. If necessary, replace the cap or gasket with genuine STIHL parts to ensure a proper seal.
3. Cracked or Damaged Oil Tank or Oil Lines
Physical damage to the oil tank or oil lines can cause leaks. This damage can occur due to accidental impacts, wear, and tear, or exposure to harsh environmental conditions.
Solution: Carefully inspect the oil tank and oil lines for any cracks, holes, or damage. If you find any, the affected parts should be replaced promptly.
4. Incorrectly Installed or Worn Oil Pump
The oil pump is responsible for delivering oil to the chain. If the oil pump is not correctly installed or becomes worn over time, it may leak oil.
Verify that the oil pump is correctly installed and functioning correctly. If the pump is worn or damaged, it may need replacement by a professional.
5. Using Low-Quality Chain Oil
Using low-quality or improper chain oil can lead to leakage. Some oils may not have the right viscosity or properties for the chainsaw, causing them to leak or not lubricate the chain effectively.
Always use high-quality chain oil recommended by the chainsaw manufacturer. These oils are formulated to work optimally with the chainsaw’s components and reduce the risk of leakage.
6. Clogged Oil Passages or Filter
Clogs in the oil passages or oil filters can disrupt the flow of oil and cause oil leakage.
Solution: Regularly clean the oil passages and filter to ensure smooth oil flow. Follow the manufacturer’s guidelines for proper maintenance.
Stihl MS 400 Problems – FAQs
Conclusion
The STIHL MS 400 Chainsaw is a powerful and reliable tool, well-suited for professional cutting applications. Its robust construction, ergonomic design, and advanced features make it a popular choice in the chainsaw market. However, users should be aware of potential problems such as starting issues, overheating, oil leakage, and chain tensioning problems. To ensure safe and efficient operation, regular maintenance, adherence to manufacturer guidelines, and proper use of recommended lubricants are essential.
If you are searching for some of the best Stihl Chainsaws, must check the other ones on the list. Every chainsaw has its own distinct specifications. Overall, the STIHL MS 400 remains a top choice for professionals seeking a high-performance chainsaw, provided it is used and maintained correctly.
